1 /* $NetBSD: strlcpy.c,v 1.1.1.2 2014/06/13 01:48:21 christos Exp $ */ 2 /* $OpenBSD: strlcpy.c,v 1.10 2005/08/08 08:05:37 espie Exp $ */ 3 4 /* 5 * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com> 6 * 7 * Permission to use, copy, modify, and distribute this software for any 8 * purpose with or without fee is hereby granted, provided that the above 9 * copyright notice and this permission notice appear in all copies. 10 * 11 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 17 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 18 */ 19 20 /* OPENBSD ORIGINAL: lib/libc/string/strlcpy.c */ 21 #include "file.h" 22 23 #include <sys/types.h> 24 #include <string.h> 25 26 /* 27 * Copy src to string dst of size siz. At most siz-1 characters 28 * will be copied. Always NUL terminates (unless siz == 0). 29 * Returns strlen(src); if retval >= siz, truncation occurred. 30 */ 31 size_t 32 strlcpy(char *dst, const char *src, size_t siz) 33 { 34 char *d = dst; 35 const char *s = src; 36 size_t n = siz; 37 38 /* Copy as many bytes as will fit */ 39 if (n != 0 && --n != 0) { 40 do { 41 if ((*d++ = *s++) == 0) 42 break; 43 } while (--n != 0); 44 } 45 46 /* Not enough room in dst, add NUL and traverse rest of src */ 47 if (n == 0) { 48 if (siz != 0) 49 *d = '\0'; /* NUL-terminate dst */ 50 while (*s++) 51 ; 52 } 53 54 return(s - src - 1); /* count does not include NUL */ 55 } 56